Net Income Per Share - Anti-Dilutive Securities Excluded from Diluted Net Income per Share (Detail) - shares	3 Months Ended
	May 04, 2019	May 05, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share
Options and restricted stock units were excluded from calculation of diluted net earnings share	463,506	497,016
Stock Options
Antidilutive Securities Excluded from Computation of Earnings Per Share
Options and restricted stock units were excluded from calculation of diluted net earnings share	463,506	486,516
Restricted Stock Units
Antidilutive Securities Excluded from Computation of Earnings Per Share
Options and restricted stock units were excluded from calculation of diluted net earnings share		10,500